The steel ball is one of the most critical working components inside a ball bearing. During operation, it repeatedly contacts the raceways under load, so small differences in diameter, roundness, hardness, or surface condition can influence bearing vibration, noise, friction, load distribution, and operating life.
BMT produces Ball Bearing Steel Balls as bearing components for different bearing structures and mechanical applications. The supplied range includes standard metric and inch diameters, while customized sizes and precision requirements can be discussed for OEM projects. Customers can select steel balls according to the bearing design, required precision, load conditions, speed, and application environment.
BMT's experience as a bearing manufacturer also provides an important practical advantage when supplying steel balls. Instead of treating the steel ball as an isolated component, we understand how rolling element accuracy affects the completed bearing assembly and can coordinate component requirements with bearing production needs.
|
Diameter |
Kgs per 1000 pcs |
No. of balls per kg |
Diameter |
Kgs per 1000 pcs |
No. of balls per kg |
|
3.175 |
0.131 |
7,634 |
14 |
11.18 |
89 |
|
3.5 |
0.175 |
5,717 |
14.2875 |
11.9 |
84 |
|
3.9688 |
0.255 |
3,922 |
15.0812 |
14 |
71.4 |
|
|
0.261 |
3,831 |
15.875 |
16.3 |
61.3 |
|
4 |
0.441 |
2,268 |
16 |
16.69 |
59.9 |
|
4.7625 |
0.51 |
1,961 |
16.6688 |
18.9 |
52.9 |
|
5 |
|
|
|
|
|
|
5.1594 |
0.56 |
1,786 |
17 |
20.02 |
50 |
|
5.5562 |
0.699 |
1,431 |
17.4625 |
21.7 |
46.1 |
|
5.9531 |
0.86 |
1,163 |
18.2562 |
24.8 |
40.3 |
|
6 |
0.881 |
1,136 |
19 |
27.96 |
35.77 |
|
6.35 |
1.04 |
962 |
19.05 |
28.2 |
35.5 |
|
6.5 |
1.119 |
894 |
19.8438 |
31.9 |
31.4 |
|
6.7469 |
1.25 |
800 |
20.6375 |
35.8 |
27.9 |
|
7.1438 |
1.49 |
671 |
21 |
37.75 |
26.49 |
|
7.9375 |
2.04 |
490 |
21.4313 |
40.1 |
24.9 |
|
|
2.09 |
478 |
22.225 |
44.8 |
22.3 |
|
8 |
2.5 |
400 |
23 |
49.59 |
20.17 |
|
8.5 |
2.71 |
369 |
23.0188 |
49.8 |
20.1 |
|
8.7312 |
|
|
|
|
|
|
9 |
2.97 |
337 |
23.8125 |
55.1 |
18.2 |
|
9.525 |
3.52 |
284 |
24 |
56.34 |
17.75 |
|
10 |
4.08 |
245 |
24.6063 |
60.8 |
16.5 |
|
10.3188 |
4.48 |
223 |
25 |
63.68 |
15.7 |
|
11 |
5.42 |
185 |
25.4 |
66.8 |
15 |
|
11.1125 |
5.6 |
179 |
26.9875 |
88.5 |
11.3 |
|
11.5 |
6.22 |
161 |
28.575 |
104.5 |
9.56 |
|
11.5094 |
6.22 |
161 |
30.1625 |
127.8 |
7.83 |
|
11.9062 |
6.88 |
145 |
31.75 |
143.8 |
6.96 |
|
12 |
7.04 |
142 |
33.3375 |
164.3 |
6.09 |
|
12.3031 |
7.6 |
132 |
34.925 |
191.7 |
5.22 |
|
12.7 |
8.35 |
120 |
36.5125 |
230 |
4.35 |
|
13.4938 |
10 |
100 |
38.1 |
287.5 |
3.48 |
|
Diameter (mm) |
Kgs per 1000 pcs |
No. of balls per kg |
|
3.175 |
0.131 |
7,634 |
|
3.5 |
0.175 |
5,717 |
|
3.9688 |
0.255 |
3,922 |
|
4 |
0.261 |
3,831 |
|
4.7625 |
0.441 |
2,268 |
|
5 |
0.51 |
1,961 |
|
5.1594 |
0.56 |
1,786 |
|
5.5562 |
0.699 |
1,431 |
|
5.9531 |
0.86 |
1,163 |
|
6 |
0.881 |
1,136 |
|
6.35 |
1.04 |
962 |
|
6.5 |
1.119 |
894 |
|
6.7469 |
1.25 |
800 |
|
7.1438 |
1.49 |
671 |
|
7.9375 |
2.04 |
490 |
For a bearing steel ball, dimensional accuracy is not simply a matter of whether the nominal diameter is correct. Consistency between individual balls in the same batch affects how load is distributed inside the bearing. Precision grinding and lapping are therefore important processes for achieving controlled diameter, roundness, and surface condition.
BMT applies automated processing and inspection procedures to bearing components as part of its manufacturing system. For customers purchasing steel balls for bearing assembly, this consistency is particularly important when large quantities of rolling elements must work together within the same production specification.
The rolling contact between the ball and raceway is continuous during bearing operation. Surface defects, roughness, or inconsistent finishing can influence friction and vibration. A controlled grinding and lapping process helps produce the smooth contact surface required by bearing applications.
The required surface finish should be matched to the bearing type and precision class rather than applying one specification to every steel ball. BMT can discuss the appropriate requirement according to the customer's bearing design and application.
Bearing steel balls must maintain suitable hardness and material consistency for repeated rolling contact and load cycles. Heat-treatment control is therefore an important part of steel ball production.
BMT can supply different material options according to application requirements, including chrome steel, stainless steel, and carbon steel configurations. For OEM projects, material selection should be evaluated together with load, corrosion conditions, operating environment, and required bearing performance.
Chrome steel is commonly selected for bearing applications where hardness, wear resistance, and rolling fatigue performance are important. These steel balls can be used in ball bearing assemblies, motors, automotive components, and general industrial equipment.
Stainless steel balls are suitable for environments where corrosion resistance is more important. They can be considered for pumps, food-related equipment, and other machinery exposed to moisture or corrosive working conditions, subject to the customer's material and application requirements.
Carbon steel provides an economical option for applications where the operating environment and performance requirements do not require the characteristics of chrome or stainless steel. The appropriate grade should be selected according to the mechanical requirements of the application.
For OEM projects, customers may require a material specification that differs from standard supply. BMT can evaluate customized material requirements according to application conditions, bearing design, and production requirements.
BMT supplies both metric and inch steel ball dimensions. The listed diameter range extends from 3.175 mm to 38.1 mm, covering small rolling elements through larger industrial bearing applications.
When selecting a steel ball, the nominal diameter should be matched with the bearing design and required tolerance. For replacement projects, the existing bearing specification or component drawing is generally the most reliable basis for confirmation.
Available precision grades include G10, G16, G20, G40, and G100, with customized grades available for specific requirements. Different applications have different demands for diameter variation and roundness, so the grade should be determined by the bearing precision and operating conditions rather than choosing the highest grade by default.
Steel balls are used in deep groove ball bearings, angular contact bearings, miniature bearings, and other rolling bearing designs. Their dimensions and precision need to correspond closely with the raceway geometry and bearing specification.
Electric motors and water pumps require consistent rolling elements because bearing vibration and running smoothness can affect the overall equipment performance. BMT steel balls can be supplied for these bearing assembly applications according to the required size and precision.
Automotive bearing systems and motorcycle components operate under varying loads, speeds, and environmental conditions. Steel ball material, hardness, diameter, and precision therefore need to be matched to the specific bearing design and application.
Conveyors, agricultural machinery, gearboxes, robotics, automation systems, and household appliances also use bearing assemblies that depend on controlled rolling element dimensions. BMT supports these industrial applications with standard and customized steel ball requirements.
BMT began its bearing manufacturing business in 2004 and has developed experience in both ball and roller bearing production. In 2005, the company started developing non-standard bearings, expanding its ability to respond to applications outside standard catalog specifications.
This background is directly relevant to bearing component supply because steel ball requirements are closely connected with the final bearing design. BMT can evaluate component specifications from the perspective of the complete bearing assembly rather than treating the steel ball only as a general-purpose metal product.
BMT operates approximately 100 automatic grinding production lines and automatic assembly lines, with annual bearing production capacity reaching approximately 100 million sets. Measuring and testing equipment is used to control manufacturing quality throughout the production process.
For bearing factories and industrial OEM customers, production consistency is a key consideration when purchasing large quantities of steel balls. BMT's established automated production system provides the capacity required for recurring industrial orders.
BMT has been assessed and registered under ISO9001 and IATF 16949:2016 quality management systems. Standardized production and inspection procedures are applied across the manufacturing process, supporting consistent component quality for domestic and international customers.
Not every bearing uses a standard steel ball size. BMT can evaluate special diameter requirements and other dimensional specifications for OEM projects. Customers can provide drawings, current component specifications, or bearing model information for technical review.
For precision bearing applications, the required steel ball grade can be specified according to the final bearing assembly. BMT can discuss G10, G16, G20, G40, G100, or customized precision requirements based on the customer's application and quality specification.
Steel balls are often purchased in large quantities for bearing assembly production. In these situations, batch-to-batch consistency is just as important as individual component accuracy. BMT's automated manufacturing capability and annual bearing production capacity of approximately 100 million sets support recurring industrial and OEM supply requirements.
Material quality is checked before entering production to ensure that the selected steel specification matches the customer's requirement. For applications requiring a specific material or mechanical property, the corresponding material specification should be confirmed before production.
Diameter, roundness, and surface condition are important control points for bearing steel balls. BMT uses measuring and inspection equipment to verify product dimensions and manufacturing consistency.
Heat-treatment and hardness requirements are evaluated according to the applicable material and product specification. Finished steel balls undergo final quality verification before packaging and shipment so that the supplied batch meets the agreed technical requirements.
BMT supports industrial customers with bulk packing and export supply arrangements according to order requirements. Packaging can be discussed based on quantity, transport conditions, customer labeling requirements, and OEM purchasing procedures.
BMT has export experience serving customers in Europe, South America, Southeast Asia, the Middle East, and other international markets. This allows distributors, bearing manufacturers, and industrial OEM buyers to coordinate steel ball procurement together with their broader bearing supply requirements.
BMT is a bearing manufacturer rather than only a component trading company. Since 2004, the company has built manufacturing experience in ball and roller bearings, including non-standard bearing development, automated grinding, assembly, and product inspection.
For customers sourcing steel balls, this means the product can be evaluated according to its actual role inside a bearing assembly. BMT can support standard sizes, inch and metric dimensions, different precision grades, multiple material options, and customized OEM requirements.
With approximately 100 automatic grinding production lines, automated assembly capability, ISO9001 and IATF 16949:2016 quality management systems, and annual bearing production capacity of approximately 100 million sets, BMT is positioned to support both recurring industrial orders and customized bearing component projects.
Ball bearing steel balls are the rolling elements inside ball bearings. They transfer load between the bearing rings while allowing relative rotation. Their diameter accuracy, roundness, hardness, and surface finish can affect bearing running characteristics, vibration, friction, and service life.
The listed specifications cover diameters from 3.175 mm to 38.1 mm and include both metric and inch dimensions. Additional sizes can be discussed for customized OEM requirements.
BMT can supply G10, G16, G20, G40, G100, and customized precision grades. The appropriate grade depends on the bearing design, required accuracy, operating conditions, and customer's quality specification.
The supplied material options include chrome steel, stainless steel, carbon steel, and customized materials. Material selection should be based on load, wear requirements, corrosion conditions, and the operating environment.
Yes. BMT supports bearing manufacturers, OEM production lines, distributors, and industrial equipment manufacturers. Bulk supply can be arranged according to the required diameter, material, precision grade, quantity, and packaging specification.
Yes. Customers can provide drawings, component specifications, existing bearing models, or required dimensions. BMT can evaluate customized diameter and precision requirements for OEM projects.
The steel ball should be selected according to the bearing design, nominal diameter, tolerance, precision grade, material, hardness, and operating conditions. For replacement projects, providing the existing bearing model or component drawing is the most practical way to confirm the specification.
A steel ball with controlled roundness provides more consistent contact with the bearing raceway. Large deviations can affect load distribution and running behavior, so roundness control is an important part of precision bearing component manufacturing.
BMT supports OEM projects and can discuss customized dimensions, materials, precision requirements, packaging, and labeling according to the customer's purchasing specification.
Yes. BMT's automated production system and annual bearing production capacity of approximately 100 million sets support high-volume and recurring industrial orders. Quantity, specifications, packaging, and delivery requirements can be confirmed during quotation.
BMT has been assessed and registered under ISO9001 and IATF 16949:2016 quality management systems. The company also operates automated grinding and assembly systems supported by measuring and testing equipment.
For a quotation, customers can provide the required steel ball diameter, material, precision grade, quantity, application, packaging requirements, and delivery destination. For replacement or OEM projects, a drawing or existing bearing specification can help BMT confirm the requirement more efficiently.
Address
No.183,Longfeng,West of Zhangting industrial Zone,Yuyao,Ningbo,China
Tel
